Why I struggled to source cow pelt and horns

I wanted to use a horn as a template for a 3D piece on desire paths and the animals that help forge them. 

During my research into acquiring one, I discovered that certain materials require a license for distribution, including animal parts or taxidermy supplies like cow horns and hide. 

Sales of this kind are particularly restricted since the BSE epidemic. 

After speaking with the National Longhorn Cattle Association and various abattoirs, I decided that I would try and source a horn second hand; although they are all, in a sense, very much second hand I suppose, no longer being used by the animal who grew them.